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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
((6*p-6)/p)*(((2*p)/9)*p-9) = 0
((6*p-6)*(2/9*p^2-9))/p = 0
( 2/9*p^2-9 )
2/9*p^2 = 9 // : 2/9
p^2 = 81/2
p^2 = 81/2 // ^ 1/2
abs(p) = (81/2)^(1/2)
p = (81/2)^(1/2) or p = -(81/2)^(1/2)
( 6*p-6 )
6*p-6 = 0 // + 6
6*p = 6 // : 6
p = 6/6
p = 1
p in { (81/2)^(1/2), -(81/2)^(1/2), 1 }
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